Drive for fuel pumps for combustion power engines



H. BECKER 2,000,555 DRIVE FOR FUEL PUMPS FOR COMBUSTION PQWEB ENGINES vMay 7, 1935.

Filed Deb. 1'7, 1930 llll'i I 1 l & 15:2 2?

" Patented May'7, 1935 PATENT 'OFFICE- naive run run. ruins roa COMBUS-rron rowan memes Heinrich Becker, Augsburg Maschinenf to mour.

Application December 17. 1930,

' In Germany'l'leoember This invention relates to internal combustionengines, and more particularly to fuel supply means therefor. I

One of the principal objects of the invention is the provision of a fuelfeeding meansfor internal combustion engines in which the fuel pumpisoperatedbyacammounteddirectlyonthe crankshaftoftheengine.

Another object of the invention is the provision of a multi-cylinderinternal combustion engine each cylinder having a fuel valve operated-by a mechanism which' feeds fuel to the valve of an adjacent cylinder.I

Other objects and advantages of the invention will be apparent fromthefollowing description,

the appended claims and the a drawing, in which:

Fig.1isa sectionofanenginehavingafuel pump drive cm the presentinvention;

Figs.2and3a1efrontviewsdaportionofthe engine, shown partly in section.illustrating. the two positions of the 'cam operated lever;FlgAisasectionalvlewoIapartoftheengine showing a modified form 11construction; and

Fig.5isatopplanviewofaportionofthe engineshowninflg.4. I. particularlyto the drawing yreferenceletteral'lg.lshowsaportlonof an internalcombmtion engine, having any suit- 30ablenumberofcylindersinwhicharepistons fuel Germany, amlgnor abrlkAugsburg-Humbug A. 6., Germny, a corporation of Germany SerlaINo. mm

in the housing so that the roll a will be maintained in engagement withthe cam j. The cam plate I is secured to the crank arm by screws elwhich pass through annular slots in the cam plate so that the latter maybe adjusted in the direction of 5 its movement. It will thus be apparentthat the fuel is suppliedto an engine cylinder by a fuel pump which isdriven from the crank'arm associat'ed with that particular cylinder sothat the fuel injection will take place when the piston is 1 near theupper end of its. stroke.

For engines adapted to operate in reverse directions, a second cam II isprovided in addition tothecamt. Therollgofthecam leverhmay be moved intoengagement with either of these 16 cams depending upon the direction.ofrotation desired, by longitudinal movement of the shaft 1'. Beforemoving the shaft i longitudinally the roll cisliftedfromthecam. Forthispurposes. jaw o is keyed on the shaft tso as to cooperate with 20 asimilar Jaw p provided on the hub of the lever h. when the shaft i isturned, the Jaw o engages the jaw p and lifts the roll a from the camwhich it engages, after which the shaft i is moved longitudinaliy sothat the roll a will be opposite 25 the other cam.

'I'oadiusttherollgandvarythetimethatthe injection period begins,an'adiusting screw q is provided in thehousingrofthe engine, the screwmlnsanarmhl rigidwiththeleverh (seel'ig.

1). The arm h is wide enough to contact with the screw q when lever h isin'pontion to engage either'ofthecamsforf'. Asamodiiiedform.

of construction the arrangement shown inl i'g. 4

maybeused,inwhichthepush-rodkofthefuel pumpplimgerisprovidedwithaparts.'lhispart awhichisflxedtotherodklimitsthedownward movement of the rod,as it engages the top of anuttwhichisthreadedon asleeveumountedonthepumphousing. Byturningthenut,the 40 lower limit of movement of thepush-rod k may be raised-or lowered, andasthelowerendofthepush-rodisoperablyconnectedtothecrankshaft in'themannershown'inl 'ig.Ltherollgof the camlevermaybeadiustedreiativetoitscooperating cam.

In engines in which the fuel is injected bymeansofcompressedainasshowninl 'igsiand 5 .thefuel valvesvarepreferablyoperatedatthe proper times in the cycle of operation byconnectionstothefuelpumpm. 'Ihusthe fuel valve operating means of onecylinder is ldaptedtofeedfueltothefuelvalveofanad- Jacentcylindersothattheproper amount offuelwillbesuppliedtothefuelvalvebeforethepre- Ii in the fuel valve into theengine cylinder.

determined time of opening. The part s on the pump plunger is is shownhaving an arm sl carrying a rod w which in turn is connected to theoperating lever a: of the fuel valve 11. When the fuel valve is openedcompressed air forces the fuel The fuel is supplied to the fuel valvebefore the latter opens, the fuel being forced to the fuel valve as thepump plunger of an adjacent cylinder is raised, and the fuel beingretained in the valve until the valve is opened. Thus the fuel valve ofeach cylinder may be supplied from the pump mounted on an adjacentcylinder. and operated by the crank arm associated with such adjacentcylinder.

Fig. 5 shows the fuel pump a of the cylinder designated by the numeral Iarranged to supply fuel to the valve '0 of cylinder 2, while the pumpmounted on cylinder 2 supplies fuel to the valve of the cylinder I, thefuel pipes y and z crossing to complete the necessary connectionsbetween the fuel valve chambers of the cylinders, and the pumps.

While the forms of apparatus herein described constitute preferredembodiments of the invention, it is to be understood that the inventionis not limited to these precise forms of apparatus, and that changes maybe made therein without departing from the scope of the invention whichis defined in the appended claims.

What is claimed is:

1. In an internal combustion engine, in combination, a piston andcylinder construction, a crank shaft connected to the piston, a fuelpump having a pump plunger for supplying fuel to the cylinder, a pair ofcams on the crank shaft, a cam lever pivotally supported on a fixed axisand adapted to be operated by either of said cams and operably connectedto the pump plunger, and means for moving said cam lever along said axisand from one of said cams to the other.

2. In an engine having a crank shaft and a fuel pump for supplying fuelto the engine cylinder, a

pair of cams on said crank shaft, a cam lever adapted to be operated byeither of said cams and forming a driving means for said fuel pump, arotatable and endwise movable shaft rotatably supporting said cam lever,and coupling means on said shaft and cam lever so that the lever may belifted from the cam with which it is in engagement by rotationalmovements of said shaft and moved to a position to engage the other camby longitudinal movement of said shaft.

3. In an internal combustion engine of the character described, enginecylinders, pistons operable therein, a crank shaft connected to saidpistons, cams on said crank shaft, fuel pumps provided on the sides ofsaid cylinders and each having a pump plunger mounted for reciprocatorymovements in a direction parallel to the cylinder axis for supplyingfuel to said cylinders, each fuel pump having an end thereof closelypositioned adjacent a cylinder end, a fuel supply conduit connectingeach pump end to a cylinder, and mounted plunger operating leversactuated by said cams in directions substantially radially of the crankshaft axis.

4. In an internal combustion engine, a piston and cylinder construction,a crank shaft having an eccentric crank pin operably connected to thepiston and crank arms fixed to said crank shaft and extending to oneside of the shaft axis for the support of said crank pin, a fuelinjection nozzle in the cylinder, a fuel pump for supplying fuel to saidinjection nozzle and provided on the side of the cylinder with its upperend closely adjacent the upper end of the cylinder, a short fuel pipeconnecting said pump and said nozzle, a pivoted lever for operating saidfuel pump, and a segmental shaped cam fixed on the outer end of one ofsaid crank arms and engageable with a portion of said pivoted lever tomove the same in a direction substantially radially of the crank shaftto energize said fuel pump.

. HEINRICH BECKER

